演示文稿锁定
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演示文稿锁定
Aspose.Slides 的常见用途是作为自动化工作流的一部分，创建、更新并保存 Microsoft PowerPoint 2007 (PPTX) 演示文稿。使用 Aspose.Slides 的应用程序的用户可以获取输出的演示文稿。如何防止这些演示文稿被编辑是一个常见关注点。确保自动生成的演示文稿保留其原始格式和内容非常重要。
本文说明了演示文稿和幻灯片是如何构造的，以及 Aspose.Slides for .NET 如何对演示文稿应用保护并随后移除该保护。此功能是 Aspose.Slides 独有的，撰写本文时在 Microsoft PowerPoint 中尚不可用。它为开发人员提供了一种控制其应用程序创建的演示文稿使用方式的手段。
幻灯片的组成
PPTX 幻灯片由多种组件组成，例如自动形状、表格、OLE 对象、组合形状、图片框、视频框、连接线以及可用于构建演示文稿的其他各种元素。
在 Aspose.Slides for .NET 中，幻灯片上的每个元素都会转换为 Shape 对象。换句话说，幻灯片上的每个元素要么是 Shape 对象，要么是从 Shape 派生的对象。
PPTX 的结构比较复杂，因此不像 PPT 那样可以对所有类型的形状使用通用锁定，而是针对不同形状类型提供不同的锁定类型。BaseShapeLock 类是通用的 PPTX 锁定类。Aspose.Slides for .NET 在 PPTX 中支持以下锁定类型：
- AutoShapeLock 锁定自动形状。
- ConnectorLock 锁定连接线形状。
- GraphicalObjectLock 锁定图形对象。
- GroupshapeLock 锁定组合形状。
- PictureFrameLock 锁定图片框。
对 Presentation 对象中所有 Shape 对象执行的任何操作都会应用于整个演示文稿。
应用和移除保护
应用保护可确保演示文稿无法被编辑。这是一种保护演示文稿内容的有效技术。
将保护应用于 PPTX Shape
Aspose.Slides for .NET 提供 Shape 类来处理幻灯片上的形状。
如前所述，每个形状类都有对应的形状锁定类用于保护。本文重点介绍 NoSelect、NoMove 和 NoResize 锁。这些锁可确保形状无法被选中（通过鼠标点击或其他选中方式），也无法移动或调整大小。
以下代码示例将保护应用于演示文稿中所有形状类型。
//Instatiate Presentation class that represents a PPTX file
PresentationEx pTemplate = new PresentationEx("Applying Protection.pptx");//Instatiate Presentation class that represents a PPTX file
//ISlide object for accessing the slides in the presentation
SlideEx slide = pTemplate.Slides[0];
//IShape object for holding temporary shapes
ShapeEx shape;
//Traversing through all the slides in the presentation
for (int slideCount = 0; slideCount < pTemplate.Slides.Count; slideCount++)
{
slide = pTemplate.Slides[slideCount];
//Travesing through all the shapes in the slides
for (int count = 0; count < slide.Shapes.Count; count++)
{
shape = slide.Shapes[count];
//if shape is autoshape
if (shape is AutoShapeEx)
{
//Type casting to Auto shape and getting auto shape lock
AutoShapeEx Ashp = shape as AutoShapeEx;
AutoShapeLockEx AutoShapeLock = Ashp.ShapeLock;
//Applying shapes locks
AutoShapeLock.PositionLocked = true;
AutoShapeLock.SelectLocked = true;
AutoShapeLock.SizeLocked = true;
}
//if shape is group shape
else if (shape is GroupShapeEx)
{
//Type casting to group shape and getting group shape lock
GroupShapeEx Group = shape as GroupShapeEx;
GroupShapeLockEx groupShapeLock = Group.ShapeLock;
//Applying shapes locks
groupShapeLock.GroupingLocked = true;
groupShapeLock.PositionLocked = true;
groupShapeLock.SelectLocked = true;
groupShapeLock.SizeLocked = true;
}
//if shape is a connector
else if (shape is ConnectorEx)
{
//Type casting to connector shape and getting connector shape lock
ConnectorEx Conn = shape as ConnectorEx;
ConnectorLockEx ConnLock = Conn.ShapeLock;
//Applying shapes locks
ConnLock.PositionMove = true;
ConnLock.SelectLocked = true;
ConnLock.SizeLocked = true;
}
//if shape is picture frame
else if (shape is PictureFrameEx)
{
//Type casting to picture frame shape and getting picture frame shape lock
PictureFrameEx Pic = shape as PictureFrameEx;
PictureFrameLockEx PicLock = Pic.ShapeLock;
//Applying shapes locks
PicLock.PositionLocked = true;
PicLock.SelectLocked = true;
PicLock.SizeLocked = true;
}
}
}
//Saving the presentation file
pTemplate.Save("ProtectedSample.pptx", Aspose.Slides.Export.SaveFormat.Pptx);
移除保护
使用 Aspose.Slides for .NET 应用的保护只能通过 Aspose.Slides for .NET 移除。要解锁形状，只需将已应用的锁的值设为 false。以下代码示例展示了如何在已锁定的演示文稿中解锁形状。
//Open the desired presentation
PresentationEx pTemplate = new PresentationEx("ProtectedSample.pptx");
//ISlide object for accessing the slides in the presentation
SlideEx slide = pTemplate.Slides[0];
//IShape object for holding temporary shapes
ShapeEx shape;
//Traversing through all the slides in presentation
for (int slideCount = 0; slideCount < pTemplate.Slides.Count; slideCount++)
{
slide = pTemplate.Slides[slideCount];
//Travesing through all the shapes in the slides
for (int count = 0; count < slide.Shapes.Count; count++)
{
shape = slide.Shapes[count];
//if shape is autoshape
if (shape is AutoShapeEx)
{
//Type casting to Auto shape and getting auto shape lock
AutoShapeEx Ashp = shape as AutoShapeEx;
AutoShapeLockEx AutoShapeLock = Ashp.ShapeLock;
//Applying shapes locks
AutoShapeLock.PositionLocked = false;
AutoShapeLock.SelectLocked = false;
AutoShapeLock.SizeLocked = false;
}
//if shape is group shape
else if (shape is GroupShapeEx)
{
//Type casting to group shape and getting group shape lock
GroupShapeEx Group = shape as GroupShapeEx;
GroupShapeLockEx groupShapeLock = Group.ShapeLock;
//Applying shapes locks
groupShapeLock.GroupingLocked = false;
groupShapeLock.PositionLocked = false;
groupShapeLock.SelectLocked = false;
groupShapeLock.SizeLocked = false;
}
//if shape is Connector shape
else if (shape is ConnectorEx)
{
//Type casting to connector shape and getting connector shape lock
ConnectorEx Conn = shape as ConnectorEx;
ConnectorLockEx ConnLock = Conn.ShapeLock;
//Applying shapes locks
ConnLock.PositionMove = false;
ConnLock.SelectLocked = false;
ConnLock.SizeLocked = false;
}
//if shape is picture frame
else if (shape is PictureFrameEx)
{
//Type casting to pitcture frame shape and getting picture frame shape lock
PictureFrameEx Pic = shape as PictureFrameEx;
PictureFrameLockEx PicLock = Pic.ShapeLock;
//Applying shapes locks
PicLock.PositionLocked = false;
PicLock.SelectLocked = false;
PicLock.SizeLocked = false;
}
}
}
//Saving the presentation file
pTemplate.Save("RemoveProtectionSample.pptx", Aspose.Slides.Export.SaveFormat.Pptx);